McWane Ductile uses the Tyton® gasket in both Tyton Joint® pipe and TR Flex® pipe and fittings. The circular rubber gasket has a modified bulb shape in the cross-section. The Tyton gasket conforms to ANSI/AWWA C111/A21.11 and has been engineered to ensure a water-tight and lasting seal. Gaskets are made from vulcanized synthetic rubber with a soft rubber bulb and harder heel joined in a strong, vulcanized bond. The Tyton gasket can be supplied in various elastomers for a your specific service application. All gaskets meet the requirements of the National Sanitation Foundation (NSF) Standard ANSI/NSF-61, Drinking Water System Components – Health Effects.